The reddish one was taken just after full dark; the "blue" moon was about 3:30 a.m. Both shot with Pentax k100d, 80-250 mm lens, ISO 200. The aperture was slightly smaller on the blue one because it was much brighter, even though there was a very very thin cloud cover. Anyone know if the clouds altered the perceived color, or the time of the different shots, or what?